PubMed:6799518 JSON TXT

Annnotations TAB JSON ListView MergeView

Test-Species-PubTator

Test-Species-PubDictionaries

{"project":"Test-Species-PubDictionaries","denotations":[{"id":"T1","span":{"begin":40,"end":43},"obj":"OrganismTaxon"},{"id":"T3","span":{"begin":143,"end":146},"obj":"OrganismTaxon"},{"id":"T5","span":{"begin":469,"end":472},"obj":"OrganismTaxon"},{"id":"T7","span":{"begin":1406,"end":1409},"obj":"OrganismTaxon"}],"attributes":[{"id":"A1","pred":"db_id","subj":"T1","obj":"10114"},{"id":"A2","pred":"db_id","subj":"T1","obj":"10116"},{"id":"A3","pred":"db_id","subj":"T3","obj":"10114"},{"id":"A4","pred":"db_id","subj":"T3","obj":"10116"},{"id":"A5","pred":"db_id","subj":"T5","obj":"10114"},{"id":"A6","pred":"db_id","subj":"T5","obj":"10116"},{"id":"A7","pred":"db_id","subj":"T7","obj":"10114"},{"id":"A8","pred":"db_id","subj":"T7","obj":"10116"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

Test-Species-PubDictionaries-PubMedBERT

{"project":"Test-Species-PubDictionaries-PubMedBERT","denotations":[{"id":"T1","span":{"begin":40,"end":43},"obj":"Species"},{"id":"T3","span":{"begin":143,"end":146},"obj":"Species"},{"id":"T5","span":{"begin":469,"end":472},"obj":"Species"},{"id":"T7","span":{"begin":510,"end":514},"obj":"Species"},{"id":"T8","span":{"begin":1203,"end":1211},"obj":"Species"},{"id":"T9","span":{"begin":1406,"end":1409},"obj":"Species"}],"attributes":[{"id":"A1","pred":"db_id","subj":"T1","obj":"10114"},{"id":"A2","pred":"db_id","subj":"T1","obj":"10116"},{"id":"A3","pred":"db_id","subj":"T3","obj":"10114"},{"id":"A4","pred":"db_id","subj":"T3","obj":"10116"},{"id":"A5","pred":"db_id","subj":"T5","obj":"10114"},{"id":"A6","pred":"db_id","subj":"T5","obj":"10116"},{"id":"A7","pred":"db_id","subj":"T7","obj":"269157"},{"id":"A8","pred":"db_id","subj":"T8","obj":"142498"},{"id":"A9","pred":"db_id","subj":"T9","obj":"10114"},{"id":"A10","pred":"db_id","subj":"T9","obj":"10116"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

GlyCosmos6-Glycan-Motif-Image

{"project":"GlyCosmos6-Glycan-Motif-Image","denotations":[{"id":"T1","span":{"begin":258,"end":266},"obj":"Glycan_Motif"}],"attributes":[{"id":"A1","pred":"image","subj":"T1","obj":"https://api.glycosmos.org/wurcs2image/0.10.0/png/binary/G61730RY"},{"id":"A2","pred":"image","subj":"T1","obj":"https://api.glycosmos.org/wurcs2image/0.10.0/png/binary/G21312EA"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

sentences

{"project":"sentences","denotations":[{"id":"T1","span":{"begin":0,"end":50},"obj":"Sentence"},{"id":"T2","span":{"begin":51,"end":132},"obj":"Sentence"},{"id":"T3","span":{"begin":133,"end":410},"obj":"Sentence"},{"id":"T4","span":{"begin":411,"end":505},"obj":"Sentence"},{"id":"T5","span":{"begin":506,"end":650},"obj":"Sentence"},{"id":"T6","span":{"begin":651,"end":924},"obj":"Sentence"},{"id":"T7","span":{"begin":925,"end":1091},"obj":"Sentence"},{"id":"T8","span":{"begin":1092,"end":1302},"obj":"Sentence"},{"id":"T9","span":{"begin":1303,"end":1416},"obj":"Sentence"},{"id":"T10","span":{"begin":1417,"end":1536},"obj":"Sentence"},{"id":"T11","span":{"begin":1537,"end":1691},"obj":"Sentence"},{"id":"T1","span":{"begin":0,"end":50},"obj":"Sentence"},{"id":"T2","span":{"begin":51,"end":132},"obj":"Sentence"},{"id":"T3","span":{"begin":133,"end":410},"obj":"Sentence"},{"id":"T4","span":{"begin":411,"end":505},"obj":"Sentence"},{"id":"T5","span":{"begin":506,"end":650},"obj":"Sentence"},{"id":"T6","span":{"begin":651,"end":924},"obj":"Sentence"},{"id":"T7","span":{"begin":925,"end":1091},"obj":"Sentence"},{"id":"T8","span":{"begin":1092,"end":1302},"obj":"Sentence"},{"id":"T9","span":{"begin":1303,"end":1416},"obj":"Sentence"},{"id":"T10","span":{"begin":1417,"end":1536},"obj":"Sentence"},{"id":"T11","span":{"begin":1537,"end":1691},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

GlyCosmos6-Glycan-Motif-Structure

{"project":"GlyCosmos6-Glycan-Motif-Structure","denotations":[{"id":"T1","span":{"begin":258,"end":266},"obj":"https://glytoucan.org/Structures/Glycans/G21312EA"},{"id":"T2","span":{"begin":258,"end":266},"obj":"https://glytoucan.org/Structures/Glycans/G61730RY"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

Glycosmos6-GlycoEpitope

{"project":"Glycosmos6-GlycoEpitope","denotations":[{"id":"T1","span":{"begin":258,"end":266},"obj":"http://www.glycoepitope.jp/epitopes/EP0024"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

Glycosmos6-MAT

{"project":"Glycosmos6-MAT","denotations":[{"id":"T1","span":{"begin":44,"end":49},"obj":"http://purl.obolibrary.org/obo/MAT_0000035"},{"id":"T2","span":{"begin":147,"end":152},"obj":"http://purl.obolibrary.org/obo/MAT_0000035"},{"id":"T3","span":{"begin":1410,"end":1415},"obj":"http://purl.obolibrary.org/obo/MAT_0000035"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

GlyCosmos15-Glycan

{"project":"GlyCosmos15-Glycan","denotations":[{"id":"T1","span":{"begin":258,"end":266},"obj":"Glycan"}],"attributes":[{"id":"A1","pred":"glycosmos_id","subj":"T1","obj":"https://glycosmos.org/glycans/show/G61730RY"},{"id":"A2","pred":"image","subj":"T1","obj":"https://api.glycosmos.org/wurcs2image/latest/png/binary/G61730RY"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

Glycan-GlyCosmos

{"project":"Glycan-GlyCosmos","denotations":[{"id":"T1","span":{"begin":258,"end":266},"obj":"Glycan"}],"attributes":[{"id":"A1","pred":"glycosmos_id","subj":"T1","obj":"https://glycosmos.org/glycans/show/G61730RY"},{"id":"A2","pred":"image","subj":"T1","obj":"https://api.glycosmos.org/wurcs2image/latest/png/binary/G61730RY"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

GlyCosmos-GlycoEpitope

{"project":"GlyCosmos-GlycoEpitope","denotations":[{"id":"T1","span":{"begin":258,"end":266},"obj":"http://purl.jp/bio/12/glyco/glycan#Glycan_epitope"}],"attributes":[{"id":"A1","pred":"glycoepitope_id","subj":"T1","obj":"http://www.glycoepitope.jp/epitopes/EP0024"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

GlyCosmos15-MONDO

{"project":"GlyCosmos15-MONDO","denotations":[{"id":"T1","span":{"begin":51,"end":61},"obj":"Disease"}],"attributes":[{"id":"A1","pred":"mondo_id","subj":"T1","obj":"MONDO:0004938"}],"namespaces":[{"prefix":"MONDO","uri":"http://purl.obolibrary.org/obo/MONDO_"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

GlyCosmos15-UBERON

{"project":"GlyCosmos15-UBERON","denotations":[{"id":"T1","span":{"begin":44,"end":49},"obj":"Body_part"},{"id":"T2","span":{"begin":94,"end":107},"obj":"Body_part"},{"id":"T3","span":{"begin":147,"end":152},"obj":"Body_part"},{"id":"T4","span":{"begin":480,"end":486},"obj":"Body_part"},{"id":"T5","span":{"begin":1410,"end":1415},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"uberon_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/UBERON_0000947"},{"id":"A2","pred":"uberon_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/GO_0005576"},{"id":"A3","pred":"uberon_id","subj":"T3","obj":"http://purl.obolibrary.org/obo/UBERON_0000947"},{"id":"A4","pred":"uberon_id","subj":"T4","obj":"http://purl.obolibrary.org/obo/UBERON_0000479"},{"id":"A5","pred":"uberon_id","subj":"T5","obj":"http://purl.obolibrary.org/obo/UBERON_0000947"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

GlyCosmos15-Taxon

{"project":"GlyCosmos15-Taxon","denotations":[{"id":"T1","span":{"begin":40,"end":43},"obj":"Organism"},{"id":"T3","span":{"begin":143,"end":146},"obj":"Organism"},{"id":"T5","span":{"begin":469,"end":472},"obj":"Organism"},{"id":"T7","span":{"begin":1406,"end":1409},"obj":"Organism"}],"attributes":[{"id":"A1","pred":"db_id","subj":"T1","obj":"10114"},{"id":"A2","pred":"db_id","subj":"T1","obj":"10116"},{"id":"A3","pred":"db_id","subj":"T3","obj":"10114"},{"id":"A4","pred":"db_id","subj":"T3","obj":"10116"},{"id":"A5","pred":"db_id","subj":"T5","obj":"10114"},{"id":"A6","pred":"db_id","subj":"T5","obj":"10116"},{"id":"A7","pred":"db_id","subj":"T7","obj":"10114"},{"id":"A8","pred":"db_id","subj":"T7","obj":"10116"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

GlyCosmos15-Sentences

{"project":"GlyCosmos15-Sentences","blocks":[{"id":"T1","span":{"begin":0,"end":50},"obj":"Sentence"},{"id":"T2","span":{"begin":51,"end":132},"obj":"Sentence"},{"id":"T3","span":{"begin":133,"end":410},"obj":"Sentence"},{"id":"T4","span":{"begin":411,"end":505},"obj":"Sentence"},{"id":"T5","span":{"begin":506,"end":650},"obj":"Sentence"},{"id":"T6","span":{"begin":651,"end":924},"obj":"Sentence"},{"id":"T7","span":{"begin":925,"end":1091},"obj":"Sentence"},{"id":"T8","span":{"begin":1092,"end":1302},"obj":"Sentence"},{"id":"T9","span":{"begin":1303,"end":1416},"obj":"Sentence"},{"id":"T10","span":{"begin":1417,"end":1536},"obj":"Sentence"},{"id":"T11","span":{"begin":1537,"end":1691},"obj":"Sentence"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

GlyCosmos15-GlycoEpitope

{"project":"GlyCosmos15-GlycoEpitope","denotations":[{"id":"T1","span":{"begin":258,"end":266},"obj":"http://purl.jp/bio/12/glyco/glycan#Glycan_epitope"}],"attributes":[{"id":"A1","pred":"glycoepitope_id","subj":"T1","obj":"http://www.glycoepitope.jp/epitopes/EP0024"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

GlyCosmos15-FMA

{"project":"GlyCosmos15-FMA","denotations":[{"id":"T1","span":{"begin":44,"end":49},"obj":"Body_part"},{"id":"T2","span":{"begin":147,"end":152},"obj":"Body_part"},{"id":"T3","span":{"begin":480,"end":486},"obj":"Body_part"},{"id":"T4","span":{"begin":1410,"end":1415},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"db_id","subj":"T1","obj":"FMA:3734"},{"id":"A2","pred":"db_id","subj":"T2","obj":"FMA:3734"},{"id":"A3","pred":"db_id","subj":"T3","obj":"FMA:9637"},{"id":"A4","pred":"db_id","subj":"T4","obj":"FMA:3734"}],"namespaces":[{"prefix":"FMA","uri":"http://purl.org/sig/ont/fma/fma"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

GlyCosmos15-MAT

{"project":"GlyCosmos15-MAT","denotations":[{"id":"T1","span":{"begin":44,"end":49},"obj":"Body_part"},{"id":"T2","span":{"begin":147,"end":152},"obj":"Body_part"},{"id":"T3","span":{"begin":1410,"end":1415},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"mat_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/MAT_0000035"},{"id":"A2","pred":"mat_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/MAT_0000035"},{"id":"A3","pred":"mat_id","subj":"T3","obj":"http://purl.obolibrary.org/obo/MAT_0000035"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

NCBITAXON

{"project":"NCBITAXON","denotations":[{"id":"T1","span":{"begin":40,"end":43},"obj":"OrganismTaxon"},{"id":"T3","span":{"begin":143,"end":146},"obj":"OrganismTaxon"},{"id":"T5","span":{"begin":469,"end":472},"obj":"OrganismTaxon"},{"id":"T7","span":{"begin":1406,"end":1409},"obj":"OrganismTaxon"}],"attributes":[{"id":"A1","pred":"db_id","subj":"T1","obj":"10114"},{"id":"A2","pred":"db_id","subj":"T1","obj":"10116"},{"id":"A3","pred":"db_id","subj":"T3","obj":"10114"},{"id":"A4","pred":"db_id","subj":"T3","obj":"10116"},{"id":"A5","pred":"db_id","subj":"T5","obj":"10114"},{"id":"A6","pred":"db_id","subj":"T5","obj":"10116"},{"id":"A7","pred":"db_id","subj":"T7","obj":"10114"},{"id":"A8","pred":"db_id","subj":"T7","obj":"10116"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

Anatomy-MAT

{"project":"Anatomy-MAT","denotations":[{"id":"T1","span":{"begin":44,"end":49},"obj":"Body_part"},{"id":"T2","span":{"begin":147,"end":152},"obj":"Body_part"},{"id":"T3","span":{"begin":1410,"end":1415},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"mat_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/MAT_0000035"},{"id":"A2","pred":"mat_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/MAT_0000035"},{"id":"A3","pred":"mat_id","subj":"T3","obj":"http://purl.obolibrary.org/obo/MAT_0000035"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}

Anatomy-UBERON

{"project":"Anatomy-UBERON","denotations":[{"id":"T1","span":{"begin":44,"end":49},"obj":"Body_part"},{"id":"T2","span":{"begin":94,"end":107},"obj":"Body_part"},{"id":"T3","span":{"begin":147,"end":152},"obj":"Body_part"},{"id":"T4","span":{"begin":480,"end":486},"obj":"Body_part"},{"id":"T5","span":{"begin":1410,"end":1415},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"uberon_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/UBERON_0000947"},{"id":"A2","pred":"uberon_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/GO_0005576"},{"id":"A3","pred":"uberon_id","subj":"T3","obj":"http://purl.obolibrary.org/obo/UBERON_0000947"},{"id":"A4","pred":"uberon_id","subj":"T4","obj":"http://purl.obolibrary.org/obo/UBERON_0000479"},{"id":"A5","pred":"uberon_id","subj":"T5","obj":"http://purl.obolibrary.org/obo/UBERON_0000947"}],"text":"Arachidonic acid metabolism in isolated rat aorta. Dependence of prostacyclin biosynthesis on extracellular potassium concentration.\nSlices of rat aorta were incubated in Krebs-Ringer bicarbonate buffer for measurements of immunoreactive 6-ketoprostaglandin F1 alpha, thromboxane (TX) B2, prostaglandin (PG)E2, and PGF2 alpha, and in Tris buffer (pH 9.3) for determination of prostacyclin (PGI2)-like activity. No significant generation of TXB2, PGE2, or PGF2 alpha by rat aortic tissue could be detected. The time-dependent release of 6-keto-PGF1 alpha Krebs-Ringer bicarbonate buffer closely correlated with PGI2 generation in alkaline Tris buffer. During a 30-min incubation period, 6-keto-PGF1 alpha, release was 79.8 +/- 3.3 pmol/mg at a buffer potassium concentration of 3.9 mmol/liter and significantly increased by 23% to 98.3 +/- 8.5 pmol/mg (P less than 0.025) in the absence of potassium in the incubation medium. A smaller decrease in buffer potassium concentration to 2.1 mmol/liter and an increase to 8.8 mmol/liter did not significantly alter aortic 6-keto-PGF1 alpha release. Changes in the incubation buffer sodium concentration from 144 mmol/liter to either 138 or 150 mmol/liter at a constant potassium concentration of 3.9 mmol/liter did not alter the recovery of 6-keto-PGF1 alpha. Our results support the concept that PGI2 is the predominant product of arachidonic acid metabolism in rat aorta. They further show that PGI2 can be recovered quantitatively as 6-keto-PGF1 alpha under the present in vitro conditions. In addition, this in vitro study points to the potassium ion as a modulator of vascular PGI2 synthesis with a stimulation at low potassium concentrations."}